Feel free to ask questions on our Oracle forum. That's 4 times longer! TrackBack URI Leave a Reply Cancel reply Enter your comment here... First of all, log errors was introduced to _avoid_ having to code a solution for the problem you describe.

Notify me of new posts via email. I also then ran a couple of extra tests; firstly I removed the constraints from the target table and ran the conventional path version again, this time without using LOG ERRORS: Note that because one of the errors you want to test for is a NOT NULL constraint violation on the PROMO_ID column, you need to remove this constraint from the SALES_SRC I agree that this probably won't help with the "hard" cleanliness problems, but some of the simpler ones maybe.

Tagging your error messages If you're coding a complex package, you might find it handy to issue multiple DML statements with error logging, then handle all the logged errors at once. While the "REJECT LIMIT" clause is technically optional, the default reject limit is zero, so the error logging clause is ineffective if a reject limit is not specified. The views and opinions expressed by visitors to this blog are theirs and do not necessarily reflect mine. ops$tkyte-ORA10GR2> alter table emp add constraint check_sal check (sal > 900); Table altered.

We can look further at this "factor of four" using a larger dataset. DML Error Logging Basics Managing Tables, Chapter 15 of the Administrator's Guide, explains what takes place during DML error logging. This is only logical of course as the more errors you get, the more exceptions are thrown which then lead to more rows inserted into the error table. Elapsed: 00:00:01.09 We can see immediately that simply including DML error logging in our DML statement increases the runtime by a factor of four.

DBMS_ERRLOG.CREATE_ERROR_LOG copies all the table columns into the error log (unless the table has columns in unsupported datatype; see "Errors handled by DML Error Logging" below). CREATE TABLE dest ( id NUMBER(10) NOT NULL, code VARCHAR2(10) NOT NULL, description VARCHAR2(50), CONSTRAINT dest_pk PRIMARY KEY (id) ); -- Create a dependant of the destination table. Going back to SQL*Plus, I installed the view and package from Jonathan's code and ran the tests again, but this time snapshotting the stats to see if clues suggested themselves: SQL> declare i number; begin i := 0; dbms_random.initialize(2); while i <= 100 loop insert into dmlel (pkey, field1, field2) values (trunc(dbms_random.value*10), 0, 0) LOG ERRORS INTO ERROR_LOG_DMLEL ('Iteration number: ' ||

SQL> INSERT /*+ APPEND */ INTO tgt 2 SELECT src.* 3 FROM src, (SELECT NULL FROM dual CONNECT BY ROWNUM <= 10) multi; 503320 rows created. Tom:Cool, but it does mean some consideration before launching full-on into a change over.By the way, the first sentence reads, "Taking a deeper log at the LOG ERRORS option for DML The steps below show how easy it is to create the error logging table. sales_src_arr.count SAVE EXCEPTIONS INSERT INTO sales_target VALUES sales_src_arr(i); EXCEPTION WHEN bulk_error THEN errors := SQL%BULK_EXCEPTIONS.COUNT; l_cnt := l_cnt + errors; FOR i IN 1..errors LOOP error_mesg := SQLERRM(-SQL%BULK_EXCEPTIONS(i).ERROR_CODE); INSERT INTO sales_target_errors

SQL> INSERT /*+ APPEND */ INTO tgt 2 SELECT src.* 3 FROM src, (SELECT NULL FROM dual CONNECT BY ROWNUM <= 10) multi 4 LOG ERRORS INTO tgt_exceptions; 503320 rows created. The SKIP_UNSUPPORTED parameter, if set to TRUE, instructs the error logging clause to skip over LONG, LOB, and object type columns that are not supported and omit them from the error UPDATE or MERGE operations raise a unique constraint or index violation. Get in Touch Rittman Mead Consulting Ltd.

SQL> alter table sales_target 2 add constraint amount_sold_chk 3 check (amount_sold > 0) 4 enable 5 validate 6 / Table altered. SQL> Update The following code attempts to update the CODE column for 10 rows, setting it to itself for 8 rows and to the value NULL for 2 rows. The results are conclusive: If you use DML error logging and you can insert your data with direct path, your batches can load an order of magnitude faster than if you Adding the DML error logging clause allows us to complete the insert of the valid rows.

Jonathan suggested that I run the tests again, but this time using a view and a statistics gathering package that he'd written to get a better idea of the activity during invoking dml error logging We will begin by looking at the general costs associated with invoking DML error logging. TRUNCATE TABLE dest; DECLARE TYPE t_tab IS TABLE OF dest%ROWTYPE; l_tab t_tab; l_start PLS_INTEGER; CURSOR c_source IS SELECT * FROM source; ex_dml_errors EXCEPTION; PRAGMA EXCEPTION_INIT(ex_dml_errors, -24381); BEGIN OPEN c_source; LOOP FETCH The REJECT LIMIT is used to specify the maximum number of errors before the statement fails.

said.... Oracle internally uses autonomous transaction to log the errors in Error table. SQL*Loader can provide a wealth of information about a bad record via the log, bad, and discard files, but its usefulness across all DML operations is limited. In fact, a number of STAT statistics with the largest differences show similarities with row-by-row insert costs.

The functions SQLCODE and SQLERRM are especially useful in the OTHERS exception handler because they tell you which internal exception was raised. In the next PL/SQL 101 article, I will explore the record datatype in PL/SQL: use of the %ROWTYPE anchor, how you can declare and use your own record types, record-level inserts Elapsed: 00:00:00.38 SQL> Finally, perform the same load using FORALL ... sort command : -g versus -n flag Why is the old Universal logo used for a 2009 movie? The v...

Note in particular our tags, which can help us find the bad data quickly on a busy system and also the error message assigned to each failed row (we just happen When we populated the SOURCE table we set the code to NULL for two of the rows. SIMPLE_EXPRESSION is any expression that would evaluate to a character string and is used for tagging rows in the error table to indicate the process that caused the error, the time SET TIMING ON TRUNCATE TABLE dest; INSERT INTO dest SELECT * FROM source L...

With this new feature, you use the new LOG ERRORS clause in your DML statement and Oracle Database automatically handles exceptions, writing erroneous data and details of the error message to create user pkg identified by pkg#123 default tablespace users temporary tablespace temp; grant dba to pkg; Next, a test table is created. Note that because one of the errors you want to test for is a NOT NULL constraint violation on the PROMO_ID column, you need to remove this constraint from the SA...